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P = 3 D
Ditanyakan : S' ?
Dijawab :
P = 100/Sn - 100/S'
3 = 100/25 - 100/S'
3 = 4 - 100/S'
100/S' = 4 - 3
100/S' = 1
S' = 100/1
S' = 100 cm